请问为什么不能选C?Before building a house,you will have to ________

Before building a house,you will have to( )the government'sp I seem to have met you().A：before B：ago C：yet 选哪个?为什么? Before you join the Army ,you will have to have a m（）examtio Ring me up _____ you come to my house.A.though B.as C.before ________▲______ to the left,you will see the building.答案上用的是 you'll have to come back a day before the flight leaves to c I d like-----some break.A have B to have C to 请问选哪个 为什么 56. What will you do ________ vacation? A. on B. in C. to D. have you found something ___in the house? A.eat B.to eat C.e could you please come to my house before thursday?l will be- 请问Choose a job you love and you will never have to work a da 为什么不能说we will have a five days holiday.what about going to s